Nintendo Switch Manual page 26

Using a Joy-Con grip accessory
You can attach the left and right Joy-Con
controllers to a Joy-Con grip to use them as a
single controller.
There's also a Joy-Con grip that can charge your
In addition to the normal Joy-Con grip included
with the console, there's also a Joy-Con
charging grip (sold separately).
If you have the charging grip, connect it to the
Nintendo Switch dock using the USB charging
cable (HAC-010) to charge the Joy-Con
controllers. This way, you can play Nintendo
Switch while the controllers are charging.
Using a Nintendo Switch Pro Controller
In addition to the Joy-Con controllers, you can
Joy-Con controllers.